Door-lock guard.



L. ANDERSEN & M. HANSEN.

DOOR LOCK GUARD. APPLICATION FILED JULYIBI, 190s.

Patented Mar. 2; 1909.

INVENTORJ.

WITNESSES 'flnds/vefl Z Mar-1Z0 Hansen fiz mwwv ATTORNEYS.

LUDVIG ANDERSEN AND MARTIN HANSEN, OF NEW YORK, N. Y.

DOOR-LOCK GUARD.

Specification of Letters Patent.

Application filed July 31, 1908.

Patented March 2, 1909.

Serial No. 4%,262.

To all whom it may concern:

Be it known that we, Lunvro Annansnn and MARTIN HANsEN, subjects of thKing; of Norway, and residing at New York, in the county of New York andState of New York, have invented certain new and useful .l 1.nprovements in Door-Lock Guards, of which the following is aspecification, such as will enable those skilled in the art to which itappertains to make and use the same.

This invention relates to door lock guards ol the class known as keyhole protectors and which consist of a metal plug or resembling inshape, in cross section, the shank and bit of a common key, and which,is adapted to be inserted into the key hole 'l a lock and fastenedtherein, and which is designed to prevent the opening ol the door or thepicking of the lock from either side, the said device being providedwith means operated by a key for securing it in the lock.

he invention is l'ully disclosed in the following specification, ofwhich the accompanying drawing forms a part, in which the separate partsof our improvement are designated by suitable reference characters ineach of the views, and in which;-

Figure 1 is a vertical section of a part of a door taken through thecasing of the lock and through the key hole or holes and showing ourimproved lock guard in position for use. Fig. 2 a sectional side view ofthe lock guard on a larger scale and showing a key in position to beinserted thereinto; Fig. 3 a diagrammatic view showing the casing of thelock guard in dotted lines and showing the tumblers thereof in fulllines, and showing a key in position to operate the tumblers; Fig. 4 atransverse vertical section on the line 44 of Fig. 2; and, Fig. 5 a planview of a bolt or plug which forms a part of the lock guard.

In the drawing forming part of this specification, We have shown at a apart of a door and in which is secured the ordinary lock casing b, themechanism of the lock being not shown, and said door is rovidod at itsopposite sides with the usua key holes 0 which are provided with theusual escutcheon plates 0 In the ractice of our invention, we provide alocrguard (Z adapted to be inserted into one of the key holes fromeither side of the door, and said guard consists of a case, comprisin ahorizontal top tubular member (2 and a spending bit member (1 the saidcase resembling in vertical transverse section, the shank and bit 01''an ordinary key. The case of the lock guard is preferably composed oftwo parts, as shown in Fig. l, riveted together as shown at d, and thetransverse top member d thereof is provided with a tubular bore (1, andthe depending bit member (Z of said case is provided with. a chamber din which are pivoted two rocking tumblers c and f, said tumblers beingpivoted respectively at c and f and said tumblers are normally held in ahorizontal position, the top tumbler a being provided at its oppositeends with upwardly directed noses or projections e and e", and thebottom tumbler f being provided at its opposite ends with upwardlydirected projections or noses A spiral spring g is placed between thetumblers c and fat one end thereof, and beneath the opposite end of thetumbler c is placed a sto g, and beneath the end of the bottom tum lcr fover which the spring 9 is placed is another stop 9 Vi'e also pro-' videa plug or bolt h which is adapted to be passed through the tubular topportion oi the lock guard as shown in Figs. 1 and 2, and whicii isprovided with an annular groove 71 and is held in place by a screw 7ipassed through the top of the case of the lock guard and into saidgroove, and said plug or bolt is adapted to be operated by a key 2'. Theplug or bolt 72 is provided within the top portion ol the case of thelock guard, when said plug or bolt is in position, with two annular groovcs 72/ and h and one end of said plug is provided with a head It, andthe end of the plug or bolt h in which the grooves 70 and are formed isprovided with a longitudinal slot 7L7, and the end of the plug or bolt7t opposite the head 7t passes through the lock guard, and when saidguard is in position as shown in Fig. 1, the said end of said plug orbolt projects approximately through the lock casing I), and that portionof the plug or bolt it within the lock casing, when the guard is inposition, is provided at one side with a radial pin lbs.

The key 2' consists of a flat plate member i provided at one end with ahead or handle i and the bottom edge of-the plate member *3 is providedadjacent to the end opposite the head i with a recess i, and adjacent tothe head end i with another recess 0?, and between the recesses i and iis a longer recess i.

In the operation of this device, the guard is inserted into one of thekey holes as shown in Fig. 1, and in this operation the radial pin itsis turned down, as shown in dotted lines in Fig. 1, the hey i being alsoinserted into the slot h in the plug or bolt h as is also "engage one ofthe sides I) of the lock casing b and the guard will be locked in thekey hole and cannot be removed until the hey i is again inserted andturned through a half revolution so as to throw the pin h into theposition shown in dotted lines in Fig. 1. In the normal position of thetumblers e and the nose or projection e of the tumhler e enters the slotIt in the plug or bolt h as shown in Fig. 2, and the nose or projectionf of the tumblers f also enters said slot, and the said plug or boltcannot be turned except by the key 2', the insertion of which throws thesaid tumblers into the position shown in Fig. 3, and in this positionthe nose or projection e of the tumbler e enters the groove h in theplug or bolt h and the nose or projection f of the tumbler f enters thegroove k of said plug or bolt, while the opposite noses or projectionsof said tumblers rest on the bottom edge of the key as shown in Fig. 3,and this permits the turning of the bolt or plug it by the key.

Our improved lock guard is simple in construction and operation, but canonly be manipulated by the proper key, and when said guard is in theposition shown in. Fig. 1, the lock cannot be picked and the door cannotbe opened except by a party provided with the hey i.

Having fully described our invention,

what we claim as new and desire to secure by Letters Patent, is

1. A lock guard comprising a case adapted to be inserted into a key holeof the lock, and to fit therein, a bolt passed through the top portionof said case and rotatable therein, and provided within case with twoannular grooves, the end of said bolt within said case being alsoprovided with a longitudinal slot, two rocking tumblers, pivoted in saidcase below said bolt, and provided at their opposite ends with upwardlydirected noses or projections, one nose or projection at the end of eachtumbler being adapted to enter the grooves in said bolt and the othernoses or projections at the opposite ends of said tumblers being adaptedto enter the slot in said bolt, a spring placed between said umblers atone end thereof, stops for holding said tumblers in a normal position,and a key adapted to be inserted into the slot in said bolt, and tooperate said tumblers and to rotate said bolt.

2. A look guard comprising a case adapted to be inserted into thekey-hole of a look, a bolt passed through the top portion of said case,and secured therein and rotatable therein, that part of said bolt withinsaid case being provided with annular grooves, and with a longitudinalslot, pivoted tumblers mounted in said case below said bolt, andnormally held in a horizontal position, said tumblers being provided attheir opposite ends with upwardly directed. noses or projections adaptedto enter the slot in said bolt and at their other ends with upwardlydirected noses or projections adapted to enter the annular grooves insaid bolt, one end of said. bolt being projected into the lock casing ofthe door and being provided with a radial pin, and a key adapted to beinserted into the slot in said bolt and to operate said tumblers and torotate said bolt.

In testimony that we claim the foregoing as our invention we havesigned. our names in presence of the subscribing witnesses this 29th dayof July 1908.

LUDVIG ANDERSEN. MARTIN HANSEN. Witnesses A. R. APPLEMAN, C. E.MULREANY.

